Optical sensor module utilizing optical designs to adjust gesture sensitive region, and related mobile apparatus

ABSTRACT

An optical sensor module is provided. The optical sensor module includes a light source, a first lens and a sensor device. The light source is arranged for generating a light signal. The first lens has a first optical center axis. The sensor device is disposed in correspondence with one side of the first lens. The sensor device includes a light sensitive area, and a center of the light sensitive area deviates from the first optical center axis. The sensor device is arranged for receiving a reflected signal reflected from an object in response to the light signal, and accordingly generating a sensing result.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part application of U.S. patent application filed on May 7, 2015 and having application Ser. No. 14/705,995, the entire contents of which are hereby incorporated herein by reference.

This application claims the benefit of U.S. provisional application filed on May 9, 2014 and having application Ser. No. 61/990,718, the entire contents of which are hereby incorporated herein by reference.

This application is based upon and claims priority under 35 U.S.C. 119 from Taiwan Patent Application No. 104111320 filed on Apr. 8, 2015, which is hereby specifically incorporated herein by this reference thereto.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The disclosed embodiments of the present invention relate to an optical sensor, and more particularly, to an optical sensor module utilizing optical designs to change a non-contact gesture sensitive region, and a related mobile apparatus.

2. Description of Related Art

As an optical sensor module recognizes a motion of a reflecting object (e.g. a user's hand) by detecting reflected light reflected from the reflecting object, the optical sensor module can be disposed in a mobile apparatus (e.g. a smart phone) to realize a non-contact operation. The optical sensor module is disposed outside of a display screen to avoid overlapping disposition. For example, regarding a mobile apparatus 100 shown in FIG. 1, an optical sensor module 102 is disposed on the outer periphery of a display screen 104. As a sensing region (a gesture sensitive region RN) is located directly above the optical sensor module 102, the user has to perform a non-contact (or touchless) gesture directly above a frame of the mobile apparatus 100 in order to ensure that the optical sensor module 102 can detect a reflected signal reflected from the user's hand.

However, when the user performs the non-contact gesture (e.g. the hand moves rightward or leftward), the user's elbow blocks the user's view of the display screen 104, which causes inconvenience to the user. Further, when operating the mobile phone 100 for the first time, the user performs a non-contact gesture intuitively above a center of a display area DN rather than the optical sensor module 102. In other words, the user has to learn where a non-contact gesture sensitive region is when operating the mobile phone 100 for the first time.

Thus, there is a need for a novel optical sensor design which can provide user-friendly experience.

SUMMARY OF THE INVENTION

It is therefore one objective of the present invention to provide an optical sensor module utilizing optical designs to change a non-contact gesture sensitive region, and a related mobile apparatus to solve the above problems.

According to an embodiment of the present invention, an exemplary mobile apparatus is disclosed. The exemplary mobile apparatus has a display screen having a display area and an optical sensor module. The optical sensor module is disposed outside of the display area and has a light source, a first lens and a sensor device. The light source generates a light signal. The first lens has a first optical center axis. The sensor device is disposed in correspondence with one side of the first lens and has a light sensitive area. A center axis of the light sensitive area and the first optical center axis are not coaxial. The sensor device is arranged for receiving a reflected signal reflected from an object in response to the light signal, and accordingly generates a sensing result. A projection of a sensing region of the optical sensor module on the display area covers a center of the display area.

According to another embodiment of the present invention, an exemplary mobile apparatus is disclosed. The exemplary mobile apparatus has a display screen having a display area and an optical sensor module. The optical sensor module is disposed outside of the display area. The optical sensor module has a first lens, a light source and a sensor device. The first lens has a first optical center axis. The light source generates a light signal and is disposed in correspondence with one side of the first lens. The light source has a light emitting area, and a center axis of the light emitting area and the first optical center axis are not coaxial. The sensor device has a light sensitive area and is arranged for receiving a reflected signal reflected from an object in response to the light signal, and accordingly generates a sensing result. A projection of a sensing region of the optical sensor module on the display area covers a center of the display area.

According to an embodiment of the present invention, an exemplary optical sensor module is disclosed. The exemplary optical sensor module has a light source for generating a light signal, a first lens, a second lens and a sensor device. The light source has a light emitting area. The first lens has a first optical center axis. The second lens has a second optical center axis. The light source is disposed in correspondence with one side of the second lens. The light signal generated by the light source emits to an object through the second lens and a center of the light emitting area deviates from the second optical center axis. The sensor device is disposed in correspondence with one side of the first lens, wherein the sensor device comprises a light sensitive area, and a center of the light sensitive area deviates from the first optical center axis; and the sensor device is arranged for receiving a reflected signal reflected from the object in response to the light signal, and accordingly generating a sensing result. The center of the light emitting area of the light source deviates from the corresponding second optical center axis in a first direction, the center of the light sensitive area deviates from the second optical center axis in a second direction, and an angle between the first direction and the second direction is smaller than 90 degrees.

The proposed optical sensor module may be employed in various electronic products (e.g. a portable apparatus such as a mobile phone or a tablet computer), and utilize optical path designs to adjust a non-contact gesture sensitive region, thus allowing intuitive and convenient control.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating a conventional mobile apparatus.

FIG. 2 is a diagram illustrating an exemplary optical sensor module according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 4 is an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 5 is an exemplary mobile apparatus according to an embodiment of the present invention.

FIG. 6 is a top view of an implementation of the optical sensor module shown in FIG. 5.

FIG. 7 is a side view of a sensor device shown in FIG. 6.

FIG. 8 is a diagram illustrating a center of a light sensitive area of an exemplary sensor device according to an embodiment of the present invention.

FIG. 9 is a diagram illustrating different optical paths of light signals associated with different positions of light sources according to an embodiment of the present invention.

FIG. 10 is a top view of another implementation of the optical sensor module shown in FIG. 5.

FIG. 11 is a diagram illustrating optical paths adjusted by an optical lens according to an embodiment of the present invention.

FIG. 12 is a diagram illustrating optical paths adjusted by a tilted lens corresponding to a light source according to an embodiment of the present invention.

FIG. 13 is a side view of an implementation of the mobile apparatus shown in FIG. 5.

FIG. 14 is a diagram illustrating gesture sensitive regions adjusted with cone angles of light sources according to an embodiment of the present invention.

FIG. 15 is a diagram illustrating a relation between a gesture sensitive region and an operating distance of an exemplary optical sensor module according to an embodiment of the present invention.

FIG. 16 is a diagram illustrating a relation between the extent of tilting and a dead zone of an exemplary optical sensor module according to an embodiment of the present invention.

FIG. 17 is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 18 is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 19A is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 19B is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 20A is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 20B is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 21A is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 21B is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 22A is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 22B is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 23A is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

FIG. 23B is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

By means of optical path designs (e.g. changing a light receiving range of a sensor in space, and/or changing an illumination range of a light source in space), the proposed light sensing architecture may realize a non-contact gesture sensitive region (or a non-contact working range) which meets user's habits. To facilitating an understanding of the present invention, an exemplary implementation of an electronic apparatus (or an optical sensor module), which recognizes a non-contact gesture according to a phase difference between reflected signals, is given in the following for further description of the proposed light sensing architecture. However, the proposed light sensing architecture may be employed in an electronic apparatus (or an optical sensor module) which utilizes other detection mechanisms (e.g. detecting an object image or calculating an object position) to recognize a non-contact gesture.

FIG. 2 is a diagram illustrating an exemplary optical sensor module according to an embodiment of the present invention. In this embodiment, the optical sensor module 202 may include a light source 210 (e.g. an infrared light emitting diode (LED), a laser diode or an ultraviolet LED) and a sensor device 210 (i.e. an optical sensor), wherein the sensor device 220 may include a plurality of sensing pixels P_(A)-P_(C). When the light source 210 emits a light signal S_(L), the sensor device 220 may receive a reflected signal SR reflected from an object (i.e. the user's hand) in response to the light signal S_(L), and accordingly generate a sensing result. For example, in a period of time during which the user's hand moves from left to right, as the user's hand keeps moving, reflected signals respectively received by the sensing pixels P_(A)-P_(C) (located at different positions) may have different signal waveforms, resulting in phase differences. The sensor device 220 may generate the sensing result accordingly, and the optical sensor module 202 may recognize the user's gesture according to the sensing result.

Although the sensor device 220 shown in FIG. 2 includes three sensing pixels P_(A)-P_(C), this is not meant to be a limitation of the present invention. In an alternative design, the sensor device 220 may include only one sensing pixel to detect an approaching gesture and a receding gesture. In another alternative design, the sensor device 220 may include only two sensing pixels to detect a wave gesture (a horizontal movement or a vertical movement). In yet another alternative design, the number of sensing pixels included in the sensor device 220 may be greater than three. For example, in the embodiment shown in FIG. 3, a sensor device 320 of an optical sensor module 302 may include four sensing pixels P_(A)-P_(D).

In addition, the sensing pixels P_(A)-P_(D) may be implemented by a sensor array. Please refer to FIG. 4, which is an exemplary optical sensor module according to another embodiment of the present invention. The architecture of the optical sensor module 402 is based on that of the optical sensor module 202 shown in FIG. 2 (or the optical sensor module 302 shown in FIG. 3), wherein the main difference is that a sensor device 420 may include a sensor array 422. In this embodiment, the sensor array 422 may be implemented by a proximity sensor array having a plurality of sensing pixels (each sensing pixel is labeled “P”) arranged in M rows and N columns, wherein M and N are positive integers. It should be noted that, in a case where the proposed sensor device includes at least three sensing pixels, the proposed optical sensor module may recognize every non-contact gesture (e.g. a wave gesture, an approaching gesture, a receding gesture or a rotation gesture) in space. Further, in a case where the proposed sensor device includes a sensor array, the proposed optical sensor module may further utilize image processing to calculate object positions and related movement.

In a case where an optical sensor module capable of recognizing non-contact gestures is disposed in an electronic apparatus, a mobile apparatus capable of non-contact control may be realized. Please refer to FIG. 5, which is an exemplary mobile apparatus according to an embodiment of the present invention. The mobile apparatus 500 may include, but is not limited to, an optical sensor module 502 and a display screen 504, wherein the display screen 504 has a display area D_(T). It should be noted that, even though the optical sensor module 502 is disposed outside of the display area D_(T) (e.g. on a frame of the mobile apparatus 500), a projection of a sensing region (a gesture sensitive region RT) of the optical sensor module 502 on the display area D_(T) may cover a center of the display area D_(T) with the aid of internal design of the optical sensor module 502. Further description is provided below.

Please refer to FIGS. 5-7. FIG. 6 is a top view of an implementation of the optical sensor module 502, and FIG. 7 is a side view of a sensor device 620 shown in FIG. 6. In this implementation, the optical sensor module 502 may include a light source 610, a lens 630 and the sensor device 620, wherein the lens 630 has an optical center axis C_(S). The sensor device 620 is disposed in correspondence with one side of the lens 630, and may include a light sensitive area SA, wherein a center C_(P) of the light sensitive area S_(A) deviates from the optical center axis C_(S) in a direction D_(S). The light source 610 may generate a light signal S₁. The sensor device 620 may receive a reflected signal S₂ reflected from an object (e.g. a user's hand) in response to the light signal S₁, and accordingly generate a sensing result for gesture recognition. Please note that, in order to facilitate an understanding of deviation between the sensor device 620 and the optical center axis C_(S), dashed line rectangles shown in FIG. 6 and FIG. 7 represent disposition locations of a conventional sensor device. In other words, a center of a light sensitive area of the conventional sensor device is disposed in correspondence with the optical center axis C_(S) of the lens 630 such that the optical center axis C_(S) passes through (or very close to) the center of the light sensitive area. Additionally, although the sensor device 620 shown in FIG. 7 is disposed on a plane and deviates from the optical center axis C_(S), this is not meant to be a limitation of the present invention. For example, the sensor device 620 may be disposed on a non-planar surface (e.g. a curved sursurface). As long as disposition of a center of a light sensitive area of an optical sensor deviates from an optical center axis of a corresponding lens, such variations and modifications fall within the spirit and scope of the present invention.

In this implementation, the sensor device 620 may include a sensor array (e.g. the sensor array 422 shown in FIG. 4). Hence, a central pixel of the sensor array may be regarded as the center C_(P) of the light sensitive area S_(A). Further, in a case where the sensor device 620 includes a plurality of sensing pixels disposed separately from each other, a center of respective light sensitive areas of the sensing pixels may be regarded as the center C_(P) of the light sensitive area S_(A). For example, a sensor device 820 shown in FIG. 8 includes a plurality of sensing pixels P_(W)-P_(Z), which have a plurality of light sensitive areas A_(W)-A_(Z) respectively. Hence, a geometric center C_(Q) of the light sensitive areas A_(W)-A_(Z) may be regarded as a center of a light sensitive area of the sensor device 820.

As shown in FIG. 7, the reflected signal S2 first falls on the lens 630 and then travels toward the sensor device 620. Hence, in a case where the disposition of sensor device 620 deviates from the optical center axis C_(S), the sensor device 620 may receive/detect reflected light incident on the lens 630 at a large angle. In other words, reflected light received by the sensor device 620 is not limited to light incident from directly above the lens 630 onto the lens 630. Specifically, as the center C_(P) of the light sensitive area SA deviates from the optical center axis C_(S), the reflected signal S₂ may fall on the lens 630 from only a portion of a field of view (FOV) VL (i.e. an FOV V_(P)) of the lens 630 (e.g. ranging from 10 degrees to 45 degrees), and then be received by the sensor device 620. In view of the above, by means of the deviation between the sensor device 620 and the optical center axis C_(S), the optical sensor module 502 may realize off-axis viewing/sensing. Thus, the sensing region of the optical sensor module 502 is not limited to a region directly thereabove.

As shown in FIGS. 5 and 19A, the display area D_(T) has a flat face 5041 and the optical sensor module 602 disposed in a non-display area D_(T)′ outside of the display area D_(T). In the embodiment shown in FIG. 19A, the sensor device 620 and the corresponding lens 630 are deviated parallelly to each other, so that a center axis XC_(P) of the light sensitive area of the sensor device 620 and the optical center axis C_(S) of the lens 630 are respectively perpendicular to the flat face 5041 of the display area D_(T) and are not coaxial. Thus, a projection of the sensing region of the optical sensor module 602 on the display area D_(T) is not limited to a region directly above the optical sensor module 602. In the embodiment, the lens 630 is a convex lens or the like. In addition, as shown in FIG. 20A, another optical sensor module 602 is disclosed and similar to the optical sensor module shown in FIG. 19A, but the lens 630 is correspondingly inclined to a sensor device 620. An angle θ is defined between the center axis of the light sensitive area of the sensor device 620 and the optical center axis C_(S) of the lens 630, and the angle may be smaller than 90 degrees. Therefore, the center axis XC_(P) of the light sensitive area of the sensor device 620 and an optical center axis C_(S) of the lens 630 are not coaxial. In the embodiment, a projection of a sensing region of the optical sensor module 602 on the display area D_(T) is also not limited to a region directly above the optical sensor module 602, as shown in FIG. 5.

The proposed optical sensor module may further include a microlens structure to improve sensitivity performance. For example, in the embodiment shown in FIG. 7, the optical sensor module 502 may further include a microlens structure 740, which is disposed between the lens 630 and the sensor device 620. The microlens structure 740 may be arranged for changing a path along which the reflected signal S2 travels from the lens 630 toward the sensor device 620. In one implementation, reflected light, which is incident from the lens 630 to the sensor device 620, may be converged by the microlens structure 740 first and then fall on the sensor device 620. Sensitivity performance of the optical sensor module 502 may be enhanced accordingly.

As a gesture sensitive region of an optical sensor module is an intersection of an illumination range of a light source and a sensing range of a sensor device, the proposed optical sensor module may, in addition to changing relative disposition between a sensor device and a lens to adjust an FOV of the sensor device, adjust disposition of a light source to emit a light signal to a region above a center of a display screen (or a display area), thereby allowing the user to perform a gesture above the center of the display screen (or the display area). For example, the projection of the gesture sensitive region R_(T) shown in FIG. 5 on the display area D_(T) may include the center of the display area D_(T). As further shown in FIGS. 5 and 19B, the optical sensor module 602 further has another lens 932 and the light source 910 is disposed in correspondence with one side of the lens 932, and may include a light emitting area SE. The lens 932 has an optical center axis C_(L). The light source 910 and the corresponding lens 932 are deviated parallelly to each other, so that a center axis XC_(R) of the light emitting area SE of the light source 910 and the optical center axis C_(L) of the lens 932 are respectively perpendicular to the flat face 5041 of the display area D_(T) and are not coaxial. Thus, a projection of a sensing region of the optical sensor module 602 on the display area D_(T) is not limited to a region directly above the optical sensor module 602. In the embodiment, the lens 932 is a convex lens or the like. In addition, as shown in FIG. 20B, another optical sensor module 602 is disclosed and similar to the optical sensor module 602 shown in FIG. 19B, but a lens 932 is inclined to a corresponding light source 910. An angle θ is defined between a center axis XC_(R) of the light emitting area SE of the light source 910 and an optical center axis C_(L) of the lens 932 and the angle may be smaller than 90 degrees. Therefore, the center axis XC_(R) of the light emitting area SE of the light source 910 and an optical center axis C_(L) of the lens 932 are not coaxial. In the embodiment, a projection of the sensing region of the optical sensor module 602 on the display area D_(T) is also not limited to a region directly above the optical sensor module 602. In another embodiment as shown in FIG. 9, FIG. 9 is a diagram illustrating different optical paths of light signals associated with different positions of light sources according to an embodiment of the present invention. As shown in FIG. 9, light signals emitted by a light source 910 at different positions P1-P3 have different optical paths (travels at different angles) after passing through a lens 932. Hence, even if a disposition of a sensor device of an optical sensor module does not deviate from an optical center axis, a gesture sensitive region may be adjusted according to adjustment of disposition of a light source, thus allowing the user to perform a gesture above a center of a display screen.

Respective positions of a light source and a sensor device of the proposed optical sensor module may deviate from respective optical center axes. Please refer to FIG. 10 in conjunction with FIG. 5. FIG. 10 is a top view of another implementation of the optical sensor module 502. In this implementation, an optical sensor module 1002 may include the sensor device 620 and the lens 630 shown in FIG. 6, a light source 1010 and a lens 1032. The light source 1010 is disposed in correspondence with one side of the lens 1032, wherein the light signal S₁ generated by the light source 1010 may travel through the lens 1032 toward an object (e.g. the user's hand), and the sensor device 620 may receive the reflected signal S₂ reflected from the object in response to the light signal S₁. The lens 1032 has an optical center axis C_(L), and a center C_(R) of a light emitting area SE of the light source 1010 deviates from the optical center axis C_(L) in a direction D_(L). In contrast to a conventional light source which is disposed in correspondence with the optical center axis C_(L) (a dashed line rectangle illustrated in FIG. 10 represents a disposition location of the conventional light source), the light signal S₁ emitted by the light source 1010 travels at a larger angle with respect to the optical center axis C_(L) after passing through the lens 1032. As the sensor device 620 may receive reflected light incident on the lens 630 at a larger angle, a gesture sensitive region of the optical sensor module 1002 is not limited to a region directly thereabove. The gesture sensitive region of the optical sensor module 1002 may further extend to a region above a center of the display screen 504. For example, an angle between the direction D_(S) and the direction D_(L) may be smaller than 90 degrees. This means that a component of the direction D_(S) (in which the light source 1010 deviates; in contrast to a conventional light source) in the direction D_(L) (in which the sensor device 620 deviates; in contrast to a conventional sensor device) has the same sign as the direction D_(L). Hence, light emitted by the light source 1010 may travel toward the FOV of the sensor device 620, thus increasing sensitivity performance of the optical sensor module 1002.

In addition to adjusting a disposition location of a light source, it is possible to employ other optical designs to change an optical path of a light signal generated by the light source. Please refer to FIG. 11, which is a diagram illustrating optical paths adjusted by an optical lens according to an embodiment of the present invention. As shown in FIG. 11, after passing through a prism 1132, light signals emitted from a light source 1110 at different positions P4-P6 may have optical paths parallel to each other. In other words, the light source 1110 at the different positions P₄-P₆ may correspond to different optical center axes. Hence, an optical path of a light signal generated from a light source may be changed due to disposition of an optical lens (e.g. a prism), and a gesture sensitive region may be adjusted accordingly. For example, the lens 1032 shown in FIG. 10 may be replaced with the prism 1132 shown in FIG. 11. In another example, the prism 1132 may be disposed in correspondence with another side of the lens 1032 shown in FIG. 10 (i.e. the lens 1032 is disposed between the light source 1010 and the prism 1132) so as to adjust a gesture sensitive region. It should be noted that, as long as an illumination range of a light source may be changed, it is possible to utilize another optical lens different a prism.

Please refer to FIG. 12, which is a diagram illustrating optical paths adjusted by a tilted lens corresponding to a light source according to an embodiment of the present invention. The upper portion of FIG. 12 illustrates optical paths of light signals which are emitted from a light source 1210 at different positions P₇-P₉ and travel through a lens 1232. In contrast, as illustrated in the lower portion of FIG. 12, the lens 1232 may be tilted at a specific angle to change optical paths of light signals which are emitted from the light source 1210 and travel through the lens 1232. Hence, a gesture sensitive region may be adjusted.

It should be noted that one or more than one optical design described above may be used to adjust a location/range of a gesture sensitive region. For example, only optical designs involved with a light emitting side (light source(s) and corresponding lens(es)) are utilized to adjust a location/range of a gesture sensitive region. In another example, only optical designs involved with a sensor side (sensor device(s) and corresponding lens(es)) are utilized to adjust a location/range of a gesture sensitive region. In yet another example, the optical designs involved with the light emitting side and the optical designs involved with the sensor side are used for adjusting a location/range of a gesture sensitive region. In addition, the concept of the optical designs involved with the light emitting side may be applied to the sensor side or the whole optical sensor module. For example, the whole optical sensor module 502 shown in FIG. 5 may be tilted at a specific angle, as shown in FIG. 13, which is a side view of an implementation of the mobile apparatus 500. The non-display area D_(T)′ outside of the display area D_(T) has a tilted face 501, on which the optical sensor module 502 is disposed, so as to adjust a location/range of a gesture sensitive region.

Further, it is possible to adjust a gesture sensitive region with the aid of internal design of a light source. Please refer to FIG. 14, which is a diagram illustrating gesture sensitive regions adjusted with cone angles of light sources according to an embodiment of the present invention. As shown in FIG. 14, a cone angle of a light source 1410 is larger than a cone angle of a light source 1412. Hence, an illumination range formed by light beams which are emitted from the light source 1410 and travel through a lens 1432 is wider, such that a gesture sensitive region WR₁ is larger than a gesture sensitive region WR₂. It should be noted that, as a light emitter has a cone angle, a working range may be increased when the user performs a gesture at an adequate distance. Please refer to FIG. 15, which is a diagram illustrating a relation between a gesture sensitive region and an operating distance of an exemplary optical sensor module according to an embodiment of the present invention. The optical sensor module 1502 may be used to implement the optical sensor module 502 shown in FIG. 5, and include a light source 1510, a sensor device 1520 and a plurality of lenses 1530 and 1532. In this embodiment, when a distance between the user's hand and the display screen 504 (or the optical sensor module 1502) equals a distance d1, the optical sensor module 1502 may provide a gesture sensitive region OR₁ (an intersection area for gesture operation at the distance d1); when a distance between the user's hand and the display screen 504 (or the optical sensor module 1502) equals a distance d2, the optical sensor module 1502 may provide a gesture sensitive region OR₂. As shown in FIG. 15, when the user performs a gesture at a position farther away from the display screen 504, a corresponding dead zone is smaller. In other words, a dead zone DZ₂ at the distance d2 is smaller than a dead zone DZ₁ at the distance d1.

A tilt angle of an optical sensor module may affect a size of a corresponding dead zone. Please refer to FIG. 16, which is a diagram illustrating a relation between the extent of tilting and a dead zone of an exemplary optical sensor module according to an embodiment of the present invention. In the upper portion of FIG. 16, an optical sensor module (not shown in FIG. 16) of a mobile apparatus 1600 is not tilted, and corresponds to a gesture sensitive region OR_(A). In the lower portion of FIG. 16, an optical sensor module (not shown in FIG. 16) of the mobile apparatus 1600 is tilted at a specific angle, and corresponds to a gesture sensitive region OR_(B). As shown in FIG. 16, when the user performs a gesture above a center C_(D) of a display area (not shown in FIG. 16) of the mobile apparatus 1600, the optical sensor module having a larger tilt angle corresponds to a smaller dead zone (a distance D_(B) is shorter than a distance D_(A)). In other words, when the optical sensor module has a larger tilt angle, the user may perform a gesture nearer the mobile apparatus 1600. Please note that, although the above is described with reference to a whole optical sensor module which is tilted, similar results may be obtained when only sensor device(s) and/or light source(s) of the optical sensor module is tilted.

The proposed optical sensor module may include a plurality of light sources. Please refer to FIG. 17, which is a diagram illustrating an exemplary optical sensor module according to another embodiment of the present invention. The optical sensor module 1702 may include a plurality of light sources 1710-1716 and a sensor device 1720 (implemented by a sensing pixel P_(K) in this embodiment), wherein the light sources 1710-1716 may be activated (tuned on) alternately. As a reflecting object (e.g. the user's hand) keeps moving, reflected signals (corresponding to the light sources 1710-1716) respectively received by the sensor device 1720 may have different signal waveforms, resulting in phase differences. The sensor device 1720 may generate a sensing result accordingly, and the optical sensor module 1702 may recognize the user's gesture according to the sensing result. Additionally, in a case where the light sources 1710-1716 may emit light signal having different wave length ranges, the light sources 1710-1716 may be activated simultaneously or concurrently, and the sensor device 1720 may receive reflected signals having different wave length ranges and accordingly generate the sensing result. Although FIG. 17 illustrates four light sources, this is not meant to be a limitation of the present invention. In an alternative design, the optical sensor module 1702 may include only two light sources to detect a wave gesture (a horizontal movement or a vertical movement). In another alternative design, the optical sensor module 1702 may include at least three light sources to recognize every non-contact gesture (e.g. a wave gesture, an approaching gesture, a receding gesture or a rotation gesture) in space. Further, the sensor device 1720 may be implemented by a sensor array. For example, the sensor device 1720 may be implemented by the sensor device 420 shown in FIG. 4, which is illustrated in FIG. 18.

Moreover, the optical sensor module 502 shown in FIG. 5 may be implemented by the optical sensor module 1702. In other words, the aforementioned optical designs associated with an optical sensor module may be applied to the light sources 1710-1716 and the sensor device 1720. For example, the optical sensor module 1702 may further include a plurality of first lenses and a second lens (not shown in FIG. 17), wherein the light sources 1710-1716 are disposed in correspondence with the first lenses respectively, and each light source is disposed in correspondence with one side of a corresponding first lens. The sensor device 1720 is disposed in correspondence with one side of the second lens. For example, at least one of the light sources 1710-1716 shown in FIG. 17 and a corresponding first lens may be implemented by the light source 1010 and the lens 1032 shown in FIG. 10, respectively, and the sensor device 1720 shown in FIG. 17 and the corresponding second lens may be implemented by the sensor device 620 and the lens 630 shown in FIG. 10, respectively. Specifically, regarding each light source shown in FIG. 17, in a case where a center of a light emitting area of the light source deviates from a corresponding optical center axis in a first direction, and a center of a light sensitive area of the sensor device 1720 deviates from a corresponding optical center axis in a second direction, an angle between the first direction and the second direction may be smaller than 90 degrees. It should be noted that a plurality of first directions respectively corresponding to the light sources 1710-1716 may be different. As a person skilled in the art should understand details of optical designs of the optical sensor module 1720 shown in 17 after reading the above paragraphs directed to FIGS. 5-16, further description is omitted here for brevity.

As shown in FIG. 21A, another embodiment of an optical sensor module 602′ is disclosed. A lens corresponding to a sensor device 620 of the optical sensor module 602′ is a non-symmetrical convex lens 630 a. The non-symmetrical convex lens 630 a has a first curved surface 6301 and a second curved surface 6302 with a curvature different to that of the first face 6301. The first curved surface 6301 is close to the sensor device 620 and has a first curved-surface optical center axis C_(S1). The second curved surface 6302 is farther from the sensor device 620 and has a second curved-surface optical center axis C_(S2). The first and second curved-surface optical center axes C_(S1), C_(S2) are not coaxial. In the embodiment, the first curved-surface optical center axis C_(S1) and the center axis XC_(P) of the light sensitive area are not coaxial, and the second curved-surface optical center axis C_(S2) and the center axis XC_(P) of the light sensitive area are coaxial. In addition, in another embodiment as shown FIG. 22A, an optical sensor module 602′ also uses non-symmetrical convex lens 630 a, but the first curved-surface optical center axis C_(S1) and the center axis XC_(P) of the light sensitive area are coaxial, and the second curved-surface optical center axis C_(S2) and the center axis XC_(P) of the light sensitive area are not coaxial. Further, in another embodiment as shown in FIG. 23A, all of the first and second curved-surface optical center axes C_(S1), C_(S2) and the center axis XC_(P) of the light sensitive area are not coaxial. According to the three embodiments as shown in FIGS. 21A, 22A and 23A, when the sensing region of the optical sensor module 602′ uses the non-symmetrical convex lens 630 a, a projection of a sensing region of the optical sensor module 602′ on the display area covers a center of the display area is also not limited to a region directly above the optical sensor module 602′. In comparison with the embodiment shown in FIG. 19A, the non-symmetrical convex lens 630 a and optical sensor 620 are not deviated parallelly to each other, and the optical sensor module 602′ may achieve a goal, that is the projection of the sensing region of the optical sensor module 602′ on the display area covering a center of the display area. Accordingly, an assembling space required by the optical sensor module 602′ may be greatly reduced. In addition, in each embodiment shown in FIGS. 21A, 22A and 23A, an arrangement between the light source and the corresponding lens in the optical sensor module 602′ is not limited by foregoing embodiments. For example, the lens 932 corresponding to the light source 910 may use a conventional symmetrical lens and the optical sensor module 602′ may use anyone of the arrangements between the light source 910 and the corresponding lens 932, as shown in FIGS. 19B and 20B. The optical sensor module 602′ is not limited to be implemented by these examples.

The above-mentioned pairing combinations and arrangements between the sensor device and the non-symmetrical lens are also applied to the light source 910 and another non-symmetrical lens 932 a corresponding to the light source 910. As shown in FIG. 21B, The non-symmetrical convex lens 932 a has a third curved surface 9321 and a fourth curved surface 9322 with a curvature different to that of the third curved surface 9321. The third curved surface 9321 is close to the light source 910 and has a third curved-surface optical center axis C_(L1). The fourth curved surface 9322 is farther from the light source 910 and has a fourth curved-surface optical center axis C_(L2). The third and fourth curved-surface optical center axes C_(L1), C_(L2) are not coaxial. In the embodiment, the third curved-surface optical center axis C_(L1) and the center axis XC_(R) of the light emitting area SE are not coaxial, and the fourth curved-surface optical center axis C_(L2) and the center axis XC_(R) of the light emitting area SE are coaxial. In addition, in another embodiment as shown FIG. 22B, an optical sensor module 602′ also uses the non-symmetrical convex lens 932 a, but the third curved-surface optical center axis C_(L1) and the center axis XC_(R) of the light emitting area SE are coaxial, and the fourth curved-surface optical center axis C_(L2) and the center axis XC_(R) of the light emitting area SE are not coaxial. Further, in another embodiment as shown in FIG. 23B, all of the third and fourth curved-surface optical center axes C_(L1), C_(L2) and the center axis XC_(R) of the light emitting area SE are not coaxial. According to the three embodiments as shown in FIGS. 21B, 22B and 23B, when the sensing region D_(T) of the optical sensor module 602′ uses the non-symmetrical convex lens 932 a, a projection of a sensing region of the optical sensor module 602′ on the display area covers a center of the display area is also not limited to a region directly above the optical sensor module 602′. In comparison with the embodiment shown in FIG. 19B, the non-symmetrical convex lens 932 a and the light source 910 are not deviated parallelly to each other and the optical sensor module 602′ may achieve a goal, which means that the projection of a sensing region of the optical sensor module 602′ on the display area covers a center of the display area. Accordingly, an assembling space required by the optical sensor module 602′ may be greatly reduced. In addition, in each embodiment shown in FIGS. 21A, 22A and 23A, an arrangement between the optical sensor and the corresponding lens in the optical sensor module 602′ is not limited. For example, the lens corresponding to the sensor device may use a conventional symmetrical lens and the optical sensor module 602′ may use anyone of the arrangements between the sensor device 620 and the corresponding lens 630, as shown in FIGS. 19A and 20A. The optical sensor module 602′ is not limited to be implemented by these examples. In conclusion, the proposed optical sensor module may be employed in various electronic products (e.g. a portable apparatus such as a mobile phone or a tablet computer), and utilize optical path designs to adjust a non-contact gesture sensitive region, thus allowing intuitive and convenient control.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims. 

What is claimed is:
 1. A mobile apparatus, comprising: a display screen having a display area; and an optical sensor module disposed outside of the display area and comprising a light source for generating a light signal; a first lens having a first optical center axis; and a sensor device disposed in correspondence with one side of the first lens and comprising a light sensitive area with a center axis being not coaxial to the first optical center axis, wherein the sensor device is arranged for receiving a reflected signal reflected from an object in response to the light signal, and accordingly generating a sensing result; wherein a projection of a sensing region of the optical sensor module on the display area covers a center of the display area, wherein: the first lens is a non-symmetrical lens and has a first curved surface and a second curved surface with a curvature different to that of the first curved surface, wherein the first curved surface is close to the sensor device and has a first curved-surface optical center axis; and the second curved surface is farther from the sensor device and has a second curved-surface optical center axis, wherein the first and second curved-surface optical enter axis are not coaxial; and the first or second curved-surface optical center axis is used as the first optical center axis, which is not coaxial with the center axis of the light sensitive area.
 2. The mobile apparatus of claim 1, wherein: the display area has a flat face; the sensor device and the first lens are deviated parallelly to each other, so that the center axis of the light sensitive area and the first optical center axis are respectively perpendicular to the flat face of the display area.
 3. The mobile apparatus of claim 1, wherein the first lens is correspondingly inclined to the sensor device to define an angle between the center axis of the light sensitive area of the sensor device and the first optical center axis, wherein the angle is smaller than 90 degrees.
 4. The mobile apparatus of claim 1 further comprising a tilted face formed outside of the display area and the optical sensor module is disposed on the tilted face.
 5. The mobile apparatus of claim 1, wherein the optical sensor further comprises a second lens and the light signal generated from the light source emits to the sensing area through the second lens.
 6. A mobile apparatus, comprising: a display screen having a display area; and an optical sensor module disposed outside of the display area and comprising a first lens having a first optical center axis; and a light source for generating a light signal, disposed in correspondence with one side of the first lens and comprising a light emitting area with a center axis being not coaxial to the first optical center axis; and a sensor device comprising a light sensitive area and arranged for receiving a reflected signal reflected from an object in response to the light signal, and accordingly generating a sensing result; wherein a projection of a sensing region of the optical sensor module on the display area covers a center of the display area, wherein: the first lens is a non-symmetrical lens and has a first curved surface and a second curved surface with a curvature different to that of the first curved surface, wherein the first curved surface is close to the sensor device and has a first curved-surface optical center axis; and the second curved surface is farther from the sensor device and has a second curved-surface optical center axis, wherein the first and second curved-surface optical enter axis are not coaxial; and the first or second curved-surface optical center axis is used as the first optical center axis, which is not coaxial with the center axis of the light sensitive area.
 7. The mobile apparatus of claim 6, wherein: the display area has a flat face; the light source and the first lens are deviated parallelly to each other, so that the center axis of the light emitting area and the first optical center axis are respectively perpendicular to the flat face of the display area.
 8. The mobile apparatus of claim 6, wherein the first lens is correspondingly inclined to the light source to define an angle between the center axis of the light emitting area of the light source and the first optical center axis, wherein the angle is smaller than 90 degrees.
 9. The mobile apparatus of claim 6 further comprising a tilted face formed outside of the display area and the optical sensor module is disposed on the tilted face.
 10. The mobile apparatus of claim 6, wherein the optical sensor further comprises a second lens having a second optical center axis, and the sensor device is disposed in correspondence with one side of the second lens, wherein a center axis of the light sensitive area and the second optical center axis are not coaxial.
 11. The mobile apparatus of claim 10, wherein: the display area has a flat face; the sensor device and the second lens are deviated parallelly to each other, so that the center axis of the light sensitive area and the second optical center axis are respectively perpendicular to the flat face of the display area.
 12. The mobile apparatus of claim 10, wherein the second lens is correspondingly inclined to the sensor device to define an angle between the center axis of the light sensitive area of the sensor device and the second optical center axis, wherein the angle is smaller than 90 degrees.
 13. The mobile apparatus of claim 10, wherein the second lens is a non-symmetrical lens and has a third curved surface and a fourth curved surface with a curvature different to that of the third curved surface, wherein: the third curved surface is close to the sensor device and has a third curved-surface optical center axis as the second optical center axis, which is not coaxial with the center axis of the light sensitive area; and the fourth curved surface is farther from the sensor device and has a fourth curved-surface optical center axis, wherein the first and second curved-surface optical enter axis are not coaxial.
 14. The mobile apparatus of claim 10, wherein the second lens is a non-symmetrical lens and has a third curved surface and a fourth curved surface with a curvature different to that of the third curved surface, wherein: the third curved surface is close to the sensor device and has a third curved-surface optical center axis; and the fourth curved surface is farther from the sensor device and has a fourth curved-surface optical center axis as the second optical center axis, which is not coaxial with the center axis of the light sensitive area, wherein the first and second curved-surface optical enter axis are not coaxial.
 15. An optical sensor module, comprising: a light source for generating a light signal and comprising a light emitting area; a first lens having a first optical center axis; a second lens having a second optical center axis, wherein the light source is disposed in correspondence with one side of the second lens, the light signal generated by the light source emits to an object through the second lens, and a center of the light emitting area deviates from the second optical center axis; and a sensor device disposed in correspondence with one side of the first lens comprising a light sensitive area with a center deviating from the first optical center axis, wherein the sensor device is arranged for receiving a reflected signal reflected from the object in response to the light signal, and accordingly generating a sensing result; wherein the center of the light emitting area of the light source deviates from the corresponding second optical center axis in a first direction, the center of the light sensitive area deviates from the second optical center axis in a second direction, and an angle between the first direction and the second direction is smaller than 90 degrees.
 16. The optical sensor module of claim 15, wherein the reflected signal received by the sensor device first falls on the first lens and then travels toward the sensor device; the first lens has a field of view; and the reflected signal received by the sensor device falls on the first lens from only a portion of the field of view. 